Oxford Dataset:
This dataset, Oxford 5K contains 5062 images of Oxford buildings gathered from Flickr [1]}. There are 55 query images each with a rectangular bounding box specifying the region of interest. To test large scale retrieval, it is firstly extended with a 100K Flickr imageshttp://www.robots.ox.ac.uk/ vgg/data/oxbuildings/flickr100k.html to create Oxford 105K  dataset. We further extend the dataset with 1 million Flickr imagehttp://press.liacs.nl/mirflickr/ creating Oxford 5K + Flickr 1M dataset.
